Sunnyside Yards is an active train yard utilized by the MTA, Amtrak, LIRR, and NJ Transit is also a State Superfund remediation area (Site 241006), as such, Tri-State designed and supplied a wellpoint system and groundwater treatment system capable of varying the size of the system to allow for flow, variation. The dewatering work called for a very large treatment system, consisting of a settling tank, bag filters, carbon vessels and iron sequestrant. Since the site is also an active train yard with specific access points, Tri-State was able to design and supply a system that could be compartmentalized to lessen the footprint in any one area and to allow access to areas of the site that would otherwise be cut off.